Interactive control systems for medical processing devices

ABSTRACT

A medical fluid processing device for processing blood or other fluids includes a plurality of hardware elements that perform specific functions. Different processing procedures are achieved by performing the specific functions in appropriately arranged sequences and combinations. A user accessible menu permits user selection of the desired processing procedure. A dual region, user accessible screen provides user interaction with the processing device.

This is a continuation of 08/337,639 filed Nov. 10, 1994, now U.S. Pat.No. 5,581,687.

FIELD OF THE INVENTION

The invention relates to control systems and user interfaces for fluidprocessing systems, such as blood processing systems and the like.

BACKGROUND OF THE INVENTION

Today people routinely separate whole blood by centrifugation into itsvarious therapeutic components, such as red blood cells, platelets, andplasma.

These and other medical processing devices are often controlled usingmicroprocessors with resident program software. The microprocessors alsousually include some type of interface through which the operator viewsand comprehends information regarding the operation of the fluidprocessing systems.

As the operational and performance demands upon such fluid processingsystems become more complex and sophisticated, the need exists forsimplifying the control hierarchy of microprocessor based controlsystems.

As the operational and performance demands also become more complex andsophisticated, the need exists for straightforward, yet higherinteractive user interfaces.

SUMMARY OF THE INVENTION

One aspect of the invention addresses the need for simple yet effectivecontrol systems. This aspect provides an abstract, "virtual" interfacebetween the software based applications resident in the controller andthe hardware elements of the fluid processing system. High level processsoftware resident in the controller communicates with lower levelimplementing process software in an instrument manager, instead ofcommunicating directly with hardware elements. In this way, theintermediate instrument manager isolates or "hides" allhardware-specific commands from the high level control software. Thedata flow between the instrument manager and the hardware elements ofthe system is invisible to the high level software.

The creation of the virtual interface between high level processsoftware and the hardware elements provides considerable flexibility inadding or modifying the process software.

Another aspect of the invention addresses the need for straightforwardyet highly interactive user interfaces. This aspect of the inventionprovides an interface having two distinct viewing regions, called thestatus region and the working region. Preferably, the two viewingregions are fixed in relative position and unchanging in size on theinterface screen. This provides continuity and consistency to theappearance of the interface, even as the functional hardware of thesystem cycle through different processing modes. The uniformity andconsistency of the dual viewing regions of the interface reduce operatorconfusion and the likelihood of error.

According to the invention, the status region and the working region areeach dedicated to different types and levels of information.Nevertheless, the two regions are always displayed simultaneously toprovide the operator views of both high level "big picture" information(in the status region) and low level "detailed" information (in theworking region).

The two viewing regions also allow the operator to use the interfacequickly to find and select among detailed procedures, functions, andoptions during system operation, or to perform off-line functions,without losing touch with the overall status of the ongoing procedure.The two viewing regions permit the operator to navigate what is inreality a multiple-level menu structure to attend to details on one menulevel, without necessarily moving stepwise up and down the menustructure and without losing the ability to, on command, immediatelyjump between higher and lower menu levels.

The features and advantages of the invention will become apparent fromthe following description, the drawings, and the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagrammatic view of a dual needle platelet collectionsystem that includes a controller that embodies the features of theinvention;

FIG. 2 is a diagrammatic flow chart view of the controller andassociated interface that embodies the features of the invention;

FIG. 3 is another diagrammatic view of the controller and associatedinterface shown in FIG. 2, and further showing the command and statusflow hierarchy;

FIG. 4 is a view of the dual region interface that embodies the featuresof the invention, showing the block and touch activated fields that theinterface contains;

FIG. 5 is a view of the interface shown in FIG. 4 when in a full screenmode;

FIG. 6 is a diagrammatic view of the detection and display of abnormalfunction conditions by the controller shown in FIGS. 2 and 3;

FIG. 7 is a view of the dual region interface in an alarm condition;

FIG. 8 is a view of the dual region interface in a system start-updefault condition, showing the Main Menu in the working region of theinterface screen;

FIG. 9 is a view of the condition of the interface screen with the HELPbutton activated in the status region when the Main Menu is active inthe working region of the screen;

FIG. 10 is a view of the dual region interface, showing the SelectProcedures SubMenu in the working region of the interface screen;

FIG. 11 is a view of the dual region interface, showing the installationinstructions for the install mode in the working region of the interfacescreen;

FIG. 12 is a view of the dual region interface, showing the detailedprocedures display for the collection mode in the working region of theinterface screen;

FIG. 13 is a view of the dual region interface, showing the edit/modifyscreen for the detailed procedures display in the working region of theinterface screen during the collection mode;

FIG. 14 is a view of the dual region interface, showing the Main Menu inthe working region of the interface screen during the collection mode;

FIG. 15 is a view of the dual region interface, showing the SpecialFeatures SubMenu in the working region of the interface screen duringthe collection mode;

FIG. 16 is a view of the dual region interface, with the detailedprocedures display for the collection mode in the working region, and areturn occlusion alarm in the status region; and

FIG. 17 is a view of the dual region interface, with the instructionsfor correcting the return occlusion alarm in the working region duringthe collection mode.

The invention may be embodied in several forms without departing fromits spirit or essential characteristics. The scope of the invention isdefined in the appended claims, rather than in the specific descriptionpreceding them. All embodiments that fall within the meaning and rangeof equivalency of the claims are therefore intended to be embraced bythe claims.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 shows in diagrammatic form a fluid processing system 10. Thesystem 10 can be used for processing various fluids. The system 10 isparticularly well suited for processing fluids for medical purposes,like whole blood and other suspensions of biological cellular materials.Accordingly, the illustrated embodiment shows the system 10 used forthis purpose.

I. The Separation System

The system 10 includes an arrangement of durable hardware elements, Thehardware elements will vary according to the nature and type ofprocessing system. In the context of processing whole blood, thehardware elements will include a centrifuge 12, in which whole blood(WB) is separated into its various therapeutic components, likeplatelets, plasma, and red blood cells (RBC). The hardware elements willalso include various pumps, which are typically peristaltic (designatedP1 to P4); and various in line clamps and valves (designated V1 to V3).Of course, other types of hardware elements will typically be present,which FIG. 1 does not show, like solenoids, pressure monitors, and thelike.

The system 10 typically also includes some form of a disposable fluidprocessing assembly 14 used in association with the hardware elements.

In the illustrated blood processing system 10, the assembly 14 includesa two stage processing chamber 16. In use, the centrifuge 12 rotates theprocessing chamber 16 to centrifugally separate blood components.

The construction of the two stage processing chamber 16 can vary. Forexample, it can take the form of double bags, like the processingchambers shown in Cullis et al. U.S. Pat. No. 4,146,172. Alternatively,the processing chamber 16 can take the form of an elongated two stageintegral bag, like that shown in Brown U.S. Pat. No. x,xxx,xxx.

In the illustrated blood processing system 10, the processing assembly14 also includes an array of flexible tubing that forms a fluid circuit.The fluid circuit conveys liquids to and from the processing chamber 16.The pumps P1-P4 and the valves V1-V3 engage the tubing to govern thefluid flow in prescribed ways. The fluid circuit further includes anumber of containers (designated C1 to C3) to dispense and receiveliquids during processing.

A controller 18 governs the operation of the various hardware elementsto carry out one or more processing tasks using the assembly 14. Theinvention specifically concerns important attributes of the controller18.

The system 10 can be configured to accomplish diverse types of bloodseparation processes. FIG. 1 shows the system 10 configured to carry outan automated two needle platelet collection procedure.

In a collection mode, a first tubing branch 20 and the whole blood inletpump P2 direct WB from a draw needle 22 into the first stage 24 of theprocessing chamber 16. Meanwhile, an auxiliary tubing branch 26 metersanticoagulant from the container Cl to the WB flow through theanticoagulant pump P1.

The container C2 holds saline solution. Another auxiliary tubing branch28 conveys the saline into the first tubing branch 20, via the in linevalve V1, for use in priming and purging air from the system 10 beforeprocessing begins. Saline solution is also introduced again afterprocessing ends to flush residual components from the assembly 14 forreturn to the donor.

Anticoagulated WB enters and fills the first stage 24 of the processingchamber 24. There, centrifugal forces generated during rotation of thecentrifuge 12 separate WB into red blood cells (RBC) and platelet-richplasma (PRP).

The PRP pump P4 operates to draw PRP from the first stage 24 of theprocessing chamber 16 into a second tubing branch 30 for transport tothe second stage 32 of the processing chamber 16. There, the PRP isseparated into platelet concentrate (PC) and platelet-poor plasma (PPP).

The system 10 includes a recirculation tubing branch 34 and anassociated recirculation pump P3. The processing controller 18 operatesthe pump P3 to divert a portion of the PRP exiting the first stage 24 ofthe processing chamber 16 for remixing with the WB entering the firststage 24 of the processing chamber 16.

As WB is drawn into the first chamber stage 24 for separation, theillustrated two needle system simultaneously returns RBC from the firstchamber stage 24, along with a portion of the PPP from the secondchamber stage 32, to the donor through a return needle 36 through tubingbranches 38 and 40 and in line valve V2.

The system 10 also collects PC in some of the containers C3 throughtubing branches 38 and 42 and in line valve V3 for storage andtherapeutic use. The system 10 can also collect PPP in some of thecontainers C3 through the same fluid path.

II. The System Controller

The controller 18 carries out the overall process control and monitoringfunctions for the system 10 as just described.

In the illustrated and preferred embodiment (see FIG. 2), the controllercomprises a main processing unit (MPU) 44. In the preferred embodiment,the MPU 44 comprises a type 68030 microprocessor made by MotorolaCorporation, although other types of conventional microprocessors can beused.

In the preferred embodiment, the MPU 44 employs conventional real timemulti-tasking to allocate MPU cycles to processing tasks. A periodictimer interrupt (for example, every 5 milliseconds) preempts theexecuting task and schedules another that is in a ready state forexecution. If a reschedule is requested, the highest priority task inthe ready state is scheduled. Otherwise, the next task on the list inthe ready state is scheduled.

A. Functional Hardware Control

The MPU 44 includes an application control manager 46. The applicationcontrol manager 46 administers the activation of a library 48 of controlapplications (designated A1 to A3). Each control application A1-A3prescribes procedures for carrying out given functional tasks using thesystem hardware (e.g., the centrifuge 12, the pumps P1-P4, and thevalves V1-V3) in a predetermined way. In the illustrated and preferredembodiment, the applications A1-A3 reside as process software in EPROM'sin the MPU 44.

The number of applications A1-A3 can vary. In the illustrated andpreferred embodiment, the library 48 includes at least one clinicalprocedure application A1. The procedure application A1 contains thesteps to carry out one prescribed clinical processing procedure. For thesake of example in the illustrated embodiment, the library 48 includes aprocedure application A1 for carrying out the dual needle plateletcollection process, as already generally described in connection withFIG. 1. Of course, additional procedure applications can be, andtypically will be, included. For example, the library 48 can include aprocedure application for carrying out a conventional single needleplatelet collection process.

In the illustrated and preferred embodiment, the library 48 alsoincludes at least one additional, non-procedure application. Thenon-clinical procedural application contains the procedures to carry outa system configuration or support utility. For the sake of example inthe illustrated embodiment, the library 48 includes a configurationapplication A2, which contains the procedures for allowing the operatorto configure the default operating parameters of the system 10. Thelibrary 48 also includes a main menu application A3, which coordinatesthe selection of the various applications A1-A3 by the operator, as willalso be described in greater detail later.

Of course, additional non-clinical procedure applications can be, andtypically will be, included. For example, the library 48 can include adiagnosis application, which contains the procedures aiding servicepersonnel in diagnosing and troubleshooting the functional integrity ofthe system, and a system restart application, which performs a fullrestart of the system, should the system become unable to manage orrecover from an error condition.

An instrument manager 50 also resides as process software in EPROM's inthe MPU 44. The instrument manager 50 communicates with the applicationcontrol manager 46. The instrument manager 50 also communicates with lowlevel peripheral controllers 52 for the pumps, solenoids, valves, andother functional hardware of the system.

As FIG. 3 shows, the application control manager 46 sends specifiedcommands in abstract form to the instrument manager 50, as called up bythe activated application A1-A3. In response to these abstract commands,(that will be referred to herein as "Perform₋₋ Function# commands,") theinstrument manager 50 identifies the peripheral controller orcontrollers 52 for performing the function and compileshardware-specific commands into the command tables for the particularperipheral controllers 52. The peripheral controllers 52 communicatedirectly with the hardware to implement the hardware-specific commandsgenerated by the instrument manager 50, causing the hardware to operatein a specified way to carry out the abstract Perform₋₋ Function#commands. A communication manager 54 manages low-level protocol andcommunications between the instrument manager 50 and the peripheralcontrollers 52.

As FIG. 3 also shows, the instrument manager 50 also conveys back to theapplication control manager 46 status data about the operational andfunctional conditions of the processing procedure. The status data isexpressed in terms of, for example, fluid flow rates, sensed pressures,and fluid volumes measured.

The application control manager 46 processes and uses the status data invarious ways. In one way, the application control manager 46 transmitsselected status data for display to the operator, as will be describedlater. In another way, the application control manager 46 monitorsoperational and functional conditions using the status data to detectabnormal system conditions requiring operator intervention or systemshutdown, as will also be described in greater detail later.

In the preferred embodiment (see FIG. 2), the MPU 44 also includes acondition manager 56 that resides in the data flow path between theinstrument manager 50 and the communications manager 54. The conditionmanager 56 also monitors status data and other operational states of thehardware to detect abnormal conditions that are either not detected orare left uncorrected by the application control manager 46. Upondetecting such abnormal conditions, the condition manager 56 providesfail-safe support by suspending system operation. Further details ofthis fail-safe function and other related aspects of the controller 18will be described later.

The described control hierarchy creates an abstract, "virtual" interfacebetween the applications resident in the application control manager 46and the hardware elements of the system 10. The high level processsoftware resident in the application control manager 46 communicateswith lower level implementing process software in the instrument manager50, instead of communicating directly with hardware elements. In thisway, the intermediate instrument manager 50 isolates or "hides" allhardware-specific commands from the application control manager 46. Theapplications pass abstract Perform₋₋ Function# commands to theinstrument manager 50, and the instrument manager 50 converts theseabstract commands into the specific Operate₋₋ Hardware# commands uniqueto the particular hardware elements, all without further participationby the procedure applications A1-A3 themselves. The data flow betweenthe instrument manager 50 and the hardware elements of the system 10 isinvisible to the activated application A1-A3.

The creation of the virtual interface between high level processsoftware and the hardware elements provides considerable flexibility inadding or modifying the process software of the high level applicationsA1-A3 for controlling hardware functions. New or modified processsoftware for the applications need only to include specifiedhardware-non-specific abstract Perform₋₋ Function# commands to gainimmediate linkage to the virtual hardware interface. Likewise, additionor modification of specific hardware requires only changes to the lowlevel process software of the instrument manager 50. Because of thevirtual interface, hardware changes require minimal changes to the highlevel software in the application control manager 46.

As described above, the instrument manager 50 forms a part of the sameMPU in which the application control manager 46 resides. Alternatively,because of the virtual nature of the interface, the instrument manager50 can reside on a separate processing unit.

B. User Interface Control

In the illustrated embodiment, the MPU 44 also includes an interactiveuser interface 58. The interface 58 allows the operator to view andcomprehend information regarding the operation of the system 10. Theinterface 58 also allows the operator to select applications residing inthe application control manager 46, as well as to change certainfunctions and performance criteria of the system 10.

The interface 58 includes an interface screen 60 and, preferably, anaudio device 62. The interface screen 60 displays information forviewing by the operator in alpha-numeric format and as graphical images.The audio device 62 provides audible prompts either to gain theoperator's attention or to acknowledge operator actions.

In the illustrated and preferred embodiment, the interface screen 60also serves as an input device. It receives input from the operator byconventional touch activation, as will be described later. Alternativelyor in combination with touch activation, a mouse or keyboard could beused as input devices.

An interface controller 64 communicates with the interface screen 60 andaudio device 62. The interface controller 64, in turn, communicates withan interface manager 66, which in turn communicates with the applicationcontrol manager 46. The interface controller 64 and the interfacemanager 66 reside as process software in EPROM's in the MPU 44.

In use, the application control manager 46 sends to the interfacemanager 66 specified field values reflecting selected status datareceived from the instrument manager 50. The application control manager46 also sends to the interface manager 66 prescribed abstract Create₋₋Display# and Create₋₋ Audio# commands called for by the activatedapplication.

The interface manager 66 processes these field values and the abstractCreate₋₋ Display# commands to generate specific Format₋₋ Display#commands. The Format₋₋ Display# commands control the particular format,attributes, and protocols necessary to create, refresh, and close thevisual display on the interface screen 60.

Likewise, the interface manager 66 processes the abstract Create₋₋Audio# commands to generate specific Format₋₋ Audio# commands. TheFormat₋₋ Audio# commands dictate the format and attributes of the audiooutput called for by the activated application.

The interface manager 66 conveys the processed Format₋₋ Display# and ₋₋Audio# commands to the interface controller 64. The interface controller64 provides low level control functions that draw boxes and lines, formstext or graphical characters, and provides the formatting attributes ofthe display on the interface screen 60. The interface controller 64 alsoprovides low level control functions that drive the audio device 62based upon Format₋₋ Audio# commands received from the interface manager66.

The interface controller 64 also accepts Field#₋₋ Select commandsgenerated by touch activation of the interface screen 60, as will bedescribed in greater detail later. The interface controller 64 passesthis touch activated input to the interface manager 66 in the form ofTouch#₋₋ Codes. The interface manager 66 processes the Touch#₋₋ Codes tothe application control manager 46, either as function codes or aschanged field values. The application control manager 46 implements thefunction codes or changed field values and passes them to the instrumentmanager 50. Further details of this will be provided later.

This control hierarchy also creates an abstract, "virtual" interfacebetween the functional processors of the controller 18 and the interface58. The high process software of the interface manager 66 isolates and"hides" all formatting and protocol issues used in creating theinterface 58 from the applications used to control hardware functions ofthe system 10. The process software of the applications A1-A3, throughthe application control manager 46, pass abstract field values andCreate₋₋ Display# and Create₋₋ Audio# commands to the interface manager66. The process software of the interface manager 66 converts theseabstract commands into the specific commands that control the textualand graphic formats and audio formats of the operator interface 58,without further participation by the procedure applications A1-A3themselves. The data flow between the interface manager 66 and theinterface controller 64 is invisible to the data flow between theapplication control manager 46 and the instrument manager 50.

This control hierarchy lends further flexibility in adding or modifyingapplications for controlling hardware functions. New or modifiedapplications need only to include textual field value outputs and theprescribed Create₋₋ Display# or Create₋₋ Audio# commands to gainimmediate linkage to the operator interface.

(i) Interface Screen Format

In the illustrated and preferred embodiment (see FIG. 4), the Format₋₋Display# commands of the interface manager 66 formats information fordisplay on the interface screen 60 in two distinct viewing regions,called the status region 68 and the working region 70. Preferably, thetwo viewing regions 68 and 70 are fixed in relative position andunchanging in size on the interface screen 60. This provides continuityand consistency to the appearance of the interface 58, even as thefunctional hardware of the system cycle through different processingmodes. The uniformity and consistency of the dual viewing regions 68 and70 of the interface 58 reduce operator confusion and the likelihood oferror.

The status region 68 and the working region 70 are each dedicated todifferent types and levels of information. Nevertheless, the two regions68 and 70 are always displayed simultaneously to provide the operatorviews of both high level "big picture" information and low level"detailed" information.

The working region 70 provides the means for the operator to select andactivate any one of the system-resident applications A1-A3. The workingregion 70 displays all specific procedure-dependent information thencalled for by the Create₋₋ Display# commands generated by the activatedapplication A1-A3. The considerable detail of information displayed inthe working region 70 allows the operator to monitor and change theongoing process in real time.

On the other hand, the status region 68 continuously shows prescribedprocedure-dependent information of a more general and "overview" nature,about which operator routinely needs continuous knowledge and immediateaccess. The status region 68 continuously displays this generalinformation to keep the operator appraised of the overall status of theongoing process, even when the operator is using the working region 70to monitor and change more detailed aspects of the processes. In theillustrated and preferred embodiment, the status region 68 also providesmeans for the operator to respond to alarms or malfunctions.

The two viewing regions 68 and 70 allow the operator to use theinterface 58 quickly to find and select among detailed procedures,functions, and options during system operation, or to perform off-linefunctions, without losing touch with the overall status of the ongoingprocedure. The two viewing regions 68 and 70 permit the operator tonavigate what is in reality a multiple-level menu structure to attend todetails on one menu level, without necessarily moving stepwise up anddown the menu structure and without losing the ability to, on command,immediately jump between higher and lower menu levels.

In the illustrated embodiment, the viewing regions 68 and 70 arevertically separated by a graphical line or line of characters 72, withthe status region 68 occupying the upper one-third of the screen 60 andthe working region 70 occupying the lower two-thirds of the screen 60.It should be appreciated, however, that the viewing regions 68 and 70could be separated horizontally in a side by side relationship, andoccupy differing proportions of the screen 60.

The status region 68 and the working region 70 display information infields. The Format₋₋ Display# for the particular display that theinterface manager 66 generates is composed of a list of such fieldsspecifying, for each field, its location, size, and type in the regionand the format of information it contains.

As will be discussed in greater detail later, the fields can formattedas individual touch selectable buttons. The fields can also be formattedas an array of touch selectable button fields, which present a field ofchoices to the operator.

The fields can also be formatted as blocks comprising alpha or numericdata strings, or textual data comprising multiple lines of line-wrapped,scrollable text, or graphic images. The fields can also be formatted tobe bar graph fields, which display numeric format in graphical form.

The interface manager 66 includes constant (ROM-based) structures inlook-up table form that store data describing the layout and formattingof all display attributes, including regions, field type, and fieldlocation within the regions. The interface manager 66 stores dynamic(RAM-based) structures that describe the present state of the interfacedisplay. Upon receiving a given Create₋₋ Display# command from theactivated application, the interface manager 66 examines the ROM-basedtable structures and the RAM-based status structures to create or updatethe RAM-based status structures, as called for by the activatedapplication. The interface manager 66 includes a time-triggered taskroutine that performs all operations required to periodically updatescreen 60 and audio outputs. The interface manager 66 sends thisprocessed information to the interface controller 64 for implementation.

The interface manager 66 also holds a Function#₋₋ Code associated witheach touch selectable button field identified by the Touch#₋₋ Codereceived from the interface controller 64. The Function#₋₋ Codes arearranged in constant (ROM-based) look-up table form according to regionand field location within the region, as identified by the Touch#₋₋Code. The interface controller 64 registers the region and fieldlocation when a given button is touched, passing this information in theform of a Touch#₋₋ Code to the interface manager 66. The interfacemanager 66 includes a process button utility that awaits andasynchronously processes this information by examining the ROM-basedtable structure and sending the appropriate Function#₋₋ Code to theapplication control manager 46 for implementation.

The information and format selected for display in the status region 68and the working region 70 can vary. FIG. 4 shows a preferredimplementation.

1. The Status Region

In the illustrated and preferred implementation, the status region 68includes a three blocks fields 74/76/78 that provide general statusinformation about the procedure then being run.

The MAJOR MODE field 74 contains the description of the clinicalprocedure activated. For example, the procedure is "Dual Needle PlateletCollection," or any other application selected by the user and residentin the application control manager 46.

The MINOR MODE field 76 contains a one or two word description of theprocedure status. For example, for a Dual Needle Platelet Collection,the MINOR MODE field 76 can sequentially display an install mode (forinstalling disposable elements on the hardware elements); a system checkmode (for checking hardware operation before beginning processing); aprime mode (for removing air from the system before processing); acollection mode (for collecting whole blood for processing); a flush andreinfusion mode (for removing residual components from the system forreturn to the donor after processing); and a so-called wrap-up mode (forremoving disposable elements from the hardware elements afterprocessing).

The WB PROCESSED field 78 contains the amount of blood drawn from thedonor through the draw pump P2 during processing, expressed numericallyin units of ml. The WB PROCESSED field 78 is displayed when the dualneedle procedure enters the collection mode and remains displayed untilthe procedure has ended or is terminated.

In the illustrated and preferred embodiment, the status region 68 alsoincludes an array of touch selectable button fields 80/82/84/86. Asbefore described, the individual button fields 80/82/84/86, whentouched, each cause the interface manager 66 to transmit a prescribedfunction code for implementation by the application control manager 46.The touch selection of a given button field does not alter the displayof information in the blocks fields 74/76/78 on the status region 68.Any change in the interface 58 resulting from touch selection of a givenbutton in the status region 68 typically occurs in the working region70.

When touched, the HELP button field 80 calls up a context-sensitivefunction that displays in the working region 70 general, largelyqualitative information regarding the procedure status displayed in theMINOR MODE field 76.

When touched, the MENU button field 82 calls up a function that causesactivation of the main menu application and the resulting display of theMain Menu in the working region 70 (as FIG. 4 shows as a defaultcondition). As will be described in greater detail later, the Main Menuallows the operator to select for activation any application A1-A3managed by the application control manager 46.

When touched, the PROCEDURE DISPLAY button 84 field calls up a functionthat displays in the working region 70 the display of specificprocedure-dependent information then called for the activated procedureapplication.

The MENU button field 82 and the PROCEDURE DISPLAY button field 84 inthe status region 68 together make possible the rapid selection of othernon-clinical procedure applications while a given clinical procedureapplication runs, while retaining the ability to immediately return tothe particular display of specific procedure-dependent information thencalled for by the activated clinical procedure, without the need toprogress up and down through a menu tree structure or to find one'splace in a sequence of menus that are intended to lead the operatorstepwise through the procedure from start to finish.

When touched, the PAUSE/END button field 86 calls up a function thatimmediately pauses any currently operating clinical procedureapplication. At the same time, the button calls for the display in theworking region 70 of the display of specific procedure-dependentinformation called for by the activated procedure at the time that thePAUSE/END button 86 is activated. At this time, the working region 70display also preferable includes a RESUME touch activated button fieldor an END touch activated button field, to give the operator the choiceof continuing with the procedure or halting it.

In the illustrated implementation, the block fields 74/76/78 occupyfixed locations in the center of the status region 68. The MENU buttonfield 82 and the PROCEDURE DISPLAY button field 84 occupy fixedlocations on the left side, middle and bottom positions, of the statusregion 68, respectively. The HELP button field 80 occupies a fixedlocation on the right side, middle position, of the status region 68.The PAUSE/END button field 86 occupies a fixed location on the rightside, bottom position, of the status region 68.

The status region 68 also includes context-dependent NOTE/WARNING PROMPTbutton field 88 that occupies a fixed location on the right side, topposition, of the status region 68 when an alarm or warning is active.The NOTE/WARNING PROMPT button field 88 is not displayed when an alarmor warning is not active. A MUTE button field 90 also occupies a fixedlocation on the left side, top position, of the status region 68 when analarm is active. A WARNING/ALARM block field also occupies a fixedlocation on the center, bottom position, of the status region when analarm is active. Further details of the alarms and the NOTE/WARNINGPROMPT and MUTE buttons 88 and 90 and the WARNING ALARM block filed 92will be described later.

2. The Working Region

In the illustrated and preferred embodiment, the working region 70 showsby default the Main Menu display called for by the main menu applicationA3. The Main Menu display includes an array of touch selectable buttonfields 94 and 96, labeled CHOOSE PROCEDURE and SPECIAL FEATURES.

When touched, the CHOOSE PROCEDURE button field 94 calls up a functionthat displays a Procedure Submenu in the working region 70. TheProcedure Submenu lists in an array of touch selectable button fieldsall clinical procedure applications administered by the applicationcontrol manager 46, which in the illustrated implementation is the DualNeedle Procedure Application A1. When touched, a procedure applicationbutton field calls up a function that directs the application controlmanager 46 to activate the associated application. The activatedapplication generates its own designated Create₋₋ Display# commands,which the interface manager 66 implements to change the display in theworking region 70. Further details of this will be provided later.

When touched, the SPECIAL FEATURES button field 96 calls up a functionthat displays a Special Features Submenu in the working region 70. TheFeatures Submenu lists in an array of touch selectable button fieldsdesigned non-clinical procedure specific applications administered bythe application control manager 46, which in the illustratedimplementation is the Configure System Procedure Application A2. When agiven special procedures application button is touched, that applicationis activated and the display in the working region 70 changes inresponse to the Create₋₋ Display# commands of the activated application.Further details of this will be provided later.

According to the protocol established by the interface manager 66 in thepreferred implementation, only one display is active at any given timein the status and working regions 68 and 70. The operator can make inputselections using the active display, and the interface manager 66 updates and refreshes the active display with real time informationreceived from the activated application.

Conceptually, working displays on each region 68 and 70 lie on top ofeach other, with the most recent "active" display lying on top, thefirst preceding active display laying inactive beneath it, and so on. Ifthe active display is deleted or closed by the activated application, orby one of the functions called by a touch activated button field,without a new Create-Display# command, the interface manager 66 makesthe first preceding display visible and active. A display called for bya create display command is placed on top and made active untilterminated, closed, or replaced by a successive create display command.

Preferably, the interface manager 66 includes additional RAM-basedmemory to preformat frequently used displays before displaying them.Such "virtual displays" remain inactive until called for an activatedapplication or by a callable function.

In the illustrated and preferred embodiment, the interface manager 66also supports a full screen 60 mode (see FIG. 5), which can be enabledor disabled by any particular application. In the full screen 60 mode,the interface screen 60 includes a single textual or graphical blockfield 98 forming single display region. The full screen mode can beused, for example, during system start-up, initialization, and somediagnostic modes.

The following example illustrates the operation of the dual regioninterface.

EXAMPLE

FIG. 8 shows the default condition of the dual region interface screen60 that embodies the features of the invention, as it exists before theselection of a procedure application. The status region 68 is thus freeof the MAJOR MODE, MINOR MODE, WB PROCESSED, and BLOCK WARNING/ALARMfields 74/76/78/92 (see FIG. 4 for comparison). In addition, the MUTEand WARNING/NOTE button fields 88 and 90 (also see FIG. 4 forcomparison) are also empty. The working region 70 shows the Main Menu,showing a CHOOSE PROCEDURE button field 94 and a SPECIAL FEATURES buttonfield 96 already described.

FIG. 9 shows the condition of the dual region interface screen 60, afterthe operator has selected the HELP button field 80 in the status region68. The status region 68 shows no change. However, a textual field 102has been opened in the working region 70, overlying and hiding the MainMenu. The textual field 102 provides general information about the MainMenu and the selection options available in the Main Menu and in thestatus region 68. By touch selecting the MAIN MENU button 82 in thestatus region 68, the operator immediately returns to the Main Menu inthe working region 70, as FIG. 8 shows.

FIG. 10 shows the condition of the dual region interface screen 60,after the operator has selected the CHOOSE PROCEDURE button field 94 inthe working region 70. The status region 68 shows no change. The workingregion 70 shows in button fields 104 and 106 the clinical procedureapplications resident in the application control manager 46. In theillustrated embodiment, a button field 104 labeled the Dual NeedlePlatelet Procedure is shown for activating the application A1.Additional button fields would also exist (for example, a Single NeedlePlatelet Procedure button field 106, as shown) equal in number to thenumber of procedure applications residing in the application controlmanager 46.

FIG. 11 shows the condition of the dual region interface screen 60,after the operator has selected the Dual Needle Platelet button field104 in the working region 70. The status region 68 shows in the MAJORMODE field 74 that the Dual Needle Platelet Collection Procedure hasbeen selected. The Status region 68 also shows in the MINOR MODE field76 that the procedure is in the install mode. The status region shows inthe WB PROCESSED FIELD 78 that no whole blood has been collected yet.The working region 70 shows in the textual field 108 instructions forthe operator to follow in installing the disposable elements on thehardware elements. The working region 70 also shows a touch activatedCONTINUE button field 110 which, when touched, causes the instructionsin the textual field 108 to progress, taking the operator stepwisethrough the installation procedure until complete.

The MINOR MODE field 76 in the status region 68 changes as the activatedprocedure progresses through successive modes including a check ofhardware functionality, priming of the fluid flow paths to remove air,procedure start-up, and venipuncture tasks, either automatically or withthe assistance of the operator. The textual field 108 in the workingregion 70 also changes to display information, as appropriate, to promptthe operator to take steps to aid in accomplishing these tasks. In allother respects, the other visual aspects of the status region 68 andworking region 70 remain unchanged.

FIG. 12 shows the condition of the dual region interface screen 60, whenthe procedure enters the collection mode. During the collection mode,whole blood is drawn from the donor, centrifugally separated intocomponent parts, and its components either returned to the donor orcollected, as earlier described.

The Status region 68 continuously shows in the MINOR MODE field 76 thatthe procedure is in the collection mode. The status region continuouslyshows in the WB PROCESSED FIELD 78 the volume of WB drawn from thedonor. The location and attributes of the other button fields80/82/84/86 remain unchanged, unless the procedure changes operationalmode, at which time the MINOR MODE field 76 will change to reflect thismode change.

The working region 70 continuously shows in an array of prescribedtextual block fields 112 and associated prescribed touch activatedbutton fields 114 selected field values detailing the progress of theongoing procedure.

The type of information selected by the procedure application fordisplay as a field value in the working region 70 during the collectionmode can vary. In the illustrated embodiment, the block fields 112 listby way of example the donor weight, the anticoagulant (AC) ratio, therate of infusing citrate carried by the PPP returned to the donor, thevolume of PPP collected for resuspending collected PC, the amount ofadditional PPP collected as a by-product, and the amount of whole bloodyet to be processed to meet the PC yield selected for the procedure. Theassociated button fields 114 contain the current status of theseoperational factors, which are displayed as field values within thebutton fields 114.

Field values in the button field 114 change to reflect changes in thecurrent status, when they occur. For example, the amount of WB to beprocessed decrements over time toward zero. When the WB to processbutton field 114 is zero, the application prompts the operator to beginthe flush and reinfusion mode.

In the illustrated and preferred embodiment, the operator can, by touchselecting a given button field 114, modify the displayed field value.FIG. 13 shows the condition of the display screen 60 when, for example,the operator touch selects the WB TO PROCESS button field 114 in theworking region 70 to change the volume of whole blood to be processedduring the procedure. The working region 70 display changes to display atouch activated numeric keypad 116, along with block fields 118 showingthe field value to be changed, it present value, and the units in whichit is expressed. By touch activating the keypad 116, the operatorchanges and enters the new value, then selects the touch activatedReturn button field 120 to return to the working display 70 shown inFIG. 12. The field value in the WB TO PROCESS button field 114 willreflect the new field value.

As FIG. 13 shows, as the working region 70 display changes toaccommodate the edit/modify procedure just described, the status region68 display remains visible and unchanged, except to reflect changes inthe volume of whole blood processed during the edit/modify procedure orany change in operational mode called for by the activated application.

At any time the operator may choose to return to the main menu by touchselecting the MENU button field 82 in the status region 68. FIG. 14shows the condition of the display screen 60 should the operator makethis choice after having completed the exit/modify procedure justdescribed.

As FIG. 14 shows, the working region 70 of the screen changes to showthe Main Menu. The status region 68 display remains visible andunchanged, reflecting the status information at the time the MENU buttonfield 82 was activated by the operator, except to reflect ongoingchanges in the volume of blood processed (as a comparison of FIG. 14 toFIG. 12 shows) or a change in operational mode.

The operator can next proceed to touch select the Special Featuresbutton field 96, if desired. FIG. 15 shows the condition of the displayscreen when this selected is made. As FIG. 15 shows, the working region70 of the screen 68 changes to show the Features Submenu. The FeaturesSubmenu lists in an array of touch selectable button fields 122, 124,and 126 the non-procedure specific applications administered by theapplication control manager 46. Touch button field 122 activates theConfigure System Procedure Application A2. By way of further example,FIG. 15 assumes that additional non-clinical procedural applications arealso resident in the application control manager 46, such as thediagnosis application (which touch button field 124 activates) andsystem restart application (which touch button field 126 activates), aspreviously discussed.

As FIG. 15 shows, the status region 68 display remains visible andunchanged as the working region 70 display changes to show the FeaturesSubmenu. The status region 68 continues to reflect the statusinformation at the time the SPECIAL FEATURES button field 96 wasactivated by the operator, except to reflect ongoing changes in thevolume of blood processed (as a comparison of FIG. 15 to FIG. 14 shows)or changes in the operational mode.

The operator may proceed to touch select a given button field 122, 124,126 in the working region 70 shown in FIG. 15. The selected button fieldwill activate the associated application. Meanwhile, the status region68 remains visible and unchanged, except to reflect status changes inthe information fields it contains.

At any time, and regardless of the active display presently in theworking region 70, the operator may choose to again view detailed statusinformation about the clinical procedure then being implemented (asshown in the MINOR MODE field 76). To do so, the operator need only totouch select the PROCEDURE DISPLAY field button 84, which remainscontinuously visible and accessible at all times to the operator in thestatus region 68. The working region 70 display returns to the formatand attributes shown in FIG. 12 (if the process is still in thecollection mode), or whatever the format or attributes of the proceduredisplay is for the mode identified in the MINOR MODE field 76.

In this way, the status region 68 keeps the operator continuouslyinformed as to the "big picture" as the working region 70 changes toprovide access to the details of processing. The status region 68 alsoprovides the means for the operator to quickly jump through themultiple-level menu structure of the interface 58, to attend to detailson one menu level, without necessarily moving stepwise up and down themenu structure and without losing the ability to, on command,immediately jump between higher and lower menu levels.

The MINOR MODE field 76 changes to reflect mode changes made under thecontrol of the activated application. After collection ends (i.e., whenthe designated WB TO PROCESS field value shown in FIG. 12 decrements tozero), the procedure prompts the operator to enter the RBC flush andreinfusion mode, during which residual RBC are flushed and returned tothe donor. The procedure then enters a Procedure Wrap Up mode, in whichthe operator is instructed to remove the disposable components.

C. Abnormal Operational Conditions

(i) Detection

Each procedure application (see FIG. 6) defines abnormal functional andoperational states that require operator awareness and/or operatorintervention. The procedure application A1 processes status datareceived from the instrument manager 50 to determine whether any currentoperating condition constitutes a prescribed abnormal functional state.If so, the application control manager 46 issues prescribed commands tonotify the operator through the user interface 58 and, under certainconditions, suspend system operation.

As earlier described, the MPU 44 also includes the condition manager 56to provide fail-safe support to error detection functions of theapplication control manager 46. It should be appreciated that,alternatively, the condition manager 56 can reside in an auxiliaryprocessing unit (APU) (for example, a second type 68030 microprocessor),or partly in the MPU 44 and partly in an APU.

The condition manager 56 contains a list defining abnormal functionaland operational states. Some of the defined states in the conditionmanager 56 are the same as the states defined in the application controlmanager 46, while others are independent cross checks of hardwarecontrol commands and status data to verify hardware integrity that onlythe condition manager 56 undertakes.

The condition manager 56 monitors the flow of data between theinstrument manager 50 and the peripheral hardware controllers 54 (shownin FIG. 2) to determine whether any current operating condition meetsthe criteria defined for an abnormal functional state. Where possible,the condition manager 56 preferably includes a time-out period forconditions that the application control manager 46 also monitors, tothereby allow the application control manager 46 a period of time tocorrect the abnormal state.

As FIG. 6 shows, the condition manager 56 continuously sends an OK₋₋State status to the application control manager 46 as long as no currentoperating condition constitutes a defined abnormal functional state, oras long as the time-out period for a sensed abnormal functional state,if applicable, has not lapsed.

When the condition manager 56 detects a current operating condition thatmeets the criteria defined for an abnormal functional state, and if thetime-out period, if applicable, has lapsed, the condition manager 56sends a Not₋₋ OK₋₋ State# status to the application control manager 46.The Not₋₋ OK-State# status identifies to the application control manager46 the abnormal condition detected. Upon receipt of the Not₋₋ OK₋₋State# status from the condition manager 56, and regardless whether theactivated procedure application also detects the same abnormalfunctional state, the application control manager 46 issues prescribedcommands to notify the operator through the user interface 58.

Upon issuing a Not₋₋ OK₋₋ State# status, the control manager 56 goesfail-safe, suspending system operation and interrupting all furthercommunication between the application control manager 46 and theperipheral controllers 52 until the abnormal state is corrected.

(ii) Classification

In the preferred embodiment, the application control manager 46categorizes defined abnormal functional and operational states either asan alarm condition or as an attention condition. The alarm conditionscomprise functional and operational states requiring immediate operatorintervention. The attention conditions comprise functional andoperational conditions that may be transient and self-correcting overtime, or that otherwise do not require immediate operator intervention.In the preferred embodiment, the application control manager 46automatically upgrades an attention condition that remains uncorrectedfor a prescribed period of time after detection (for example, 2 minutes)to an alarm condition. The application control manager 46 alsoautomatically treats a Not₋₋ OK₋₋ State# status from the conditionmanager 56 as an alarm condition.

Examples of abnormal operational states that can be treated as alarmconditions include pump motor direction error; pump motor speed error;liquid spill detected inside the centrifuge; centrifuge rotor imbalance;control voltage power failure; centrifuge door open; centrifuge door notlocked; empty anticoagulant container.

Examples of abnormal operational states that can be treated as alarmconditions include temperature in centrifuge above limit; weight scalelimits exceeded; and anticoagulant level low.

As FIG. 6 shows, upon detection of a condition that represents an alarmcondition, the application control manager 46 generates and transmits aprescribed Create₋₋ Alarm#₋₋ Display command to the interface manager66. Likewise, upon detection of condition that represents an attentionstate, the application control manager 46 generates and transmits aprescribed Create₋₋ Note#₋₋ Display command to the interface manager 66.

Upon receipt of a prescribed Create₋₋ Alarm# or ₋₋ Note#₋₋ Display, theinterface manager 66 examines the ROM-based table structures and theRAM-based status structures to create or update the display codes toimplement the designation display and audio through the interfacecontroller 64 using the interface screen 60 and audio device 62.

In the illustrated and preferred embodiment, the interface manager 66places all displays generated in response to Create₋₋ Alarm#₋₋ Displayor Create₋₋ Note#₋₋ Display commands initially in the status region 68of the interface screen 60, as FIG. 4 shows. The interface manager 66reserves the top position on the left and right sides and the bottomcenter position of the status region 68 for the alarm and note fields88/90/92. These positions on the status region 68 remain free of anydisplay character or indicia in the absence of a sensed alarm orattention condition.

(i) Warning Alarm Interface

In response to a Create₋₋ Alarm#₋₋ Display command from the activatedprocedure application, the interface manager 66 creates the touchselectable, button field 88 (see FIG. 4) on the right side, topposition, of the status region 68. In the preferred implementation, inan alarm state, the button field 88 is colored red (the internationalalarm color) and contains the word "Warning" or some other word or wordsto denote a sense of urgency.

The interface manager 66 also creates the touch selectable mute buttonfield 90 on the left side, top position, when an alarm state is active.Touch selection of the mute button field 90 turns off a prescribed timeperiod any audible alarm associated with the alarm state.

With the creation of the button field 88, the interface manager 66creates the alarm block field 92 at the bottom of the status region 68.In an alarm state, the block field 92, also preferably colored red andbar-shaped, contains a description of the warning condition ofappropriate length.

When the operator touch selects the warning alarm button field 88 (asFIG. 7 shows), the interface manager 66 removes the button field 88 andthe block field 92 from the status region 68 and displays in a textualfield 100 in the working region 70 more detailed information regardingthe appropriate responses for the operator to follow in correcting thesensed alarm state. Working through the interface manager 66, the alarmstate of the activated procedure application maintains control over theworking region 70 of the interface, allowing no display except thoserelating to the alarm state and associated corrective measures to beactive, until the condition manager 56 and the application controlmanager 46 sense the removal of the alarm state.

(ii) Note Alarm Interface

In response to a Create₋₋ Note#₋₋ Display command from the activatedprocedure application, the interface manager 66 creates the touchselectable, button field 88 on the right side, top position, of thestatus region 68 (see FIG. 4). In the preferred implementation, in anattention state, the button field 88 is colored yellow or anothercautionary color distinguishable from the color of the button field 88in an alarm condition. The button field 88 contains the word "Note" orsome other cautionary word or words readily distinguishable from theword contained in the field 88 when in an alarm state.

The interface manager 66 also creates the touch selectable mute buttonfield 90 on the left side, top position, when an attention state isactive. Touch selection of the mute button field 90 turns off aprescribed time period any audible alarm associated with the attentionstate.

With the creation of the note alarm button field 88, the interfacemanager 66 creates the block field 92 at the bottom middle of the statusregion 68. The block field 92, preferably colored the same color as thenote alarm button field and bar-shaped, contains a description of theattention condition of appropriate length.

When the operator touch selects the note alarm button field 88, theinterface manager 66 removes the block field from the status region 68and displays in the textual field 100 (see FIG. 7) in the working region70 more detailed information and regarding the appropriate responses forthe operator to follow in correcting the sensed attention state, ifappropriate. Working through the interface manager 66, the attentionstate of the activated procedure application maintains control over theworking region 70 of the interface, allowing no display except thoserelating to the attention state and associated corrective measures to beactive, until the condition manager 56 and the application controlmanager 46 sense the removal of the attention state.

In the preferred embodiment, the alarm/note fields 88 and 92 relate onlyto a single alarm or note condition at the same time. There are nevermultiple displays of these fields at a given time, even when multipleCreate₋₋ Alarm#₋₋ Display and/or Create₋₋ Note#₋₋ Display commands arereceived. In this circumstance, the user interface manager 66 stacks themultiple commands in an alarm queue and an attention que as received.The user interface manager 66 and implements the commands for displayone at a time, on a first-in, first-out basis, except that an alarmstate takes precedence over any attention state. Touch activating theactive alarm/note button field 88 to open the associated alarm/notetextual field 100 in the working region 70, opens the alarm/warningfields 88 and 92 relating to the next prioritized alarm/attentioncommand in the status region 68. Thus, in the case of multiple pendingalarm/attention conditions, as the operator works in the working region70 to remove one condition, the status region 68 informs the operator ofanother condition that next requires attention.

The following example illustrates the operation of the interface when analarm/attention condition is sensed.

EXAMPLE

FIG. 16 shows the condition of the interface screen 60 should anocclusion in the tubing branch 40 (see FIG. 1) returning RBC and PPP tothe donor be sensed by the application control manager 46 in the mannerdescribed above. FIG. 16 assumes that, at the time that occlusion isdetected, the screen 60 had a display like that shown in FIG. 12.

As FIG. 16 shows, the display in the status region 68 changes to includethe button field 88, which is displayed in red to designate an alarmstate (as contrasted with an attention state). The status region 68 alsochanges to show the block field 92, which is also in red, and whichcontains text identifying the nature of the alarm (Return OcclusionDetected). The status region 68 also shows the MUTE button field 90,allowing the operator to mute any audible alarm called for by theapplication control manager 46 for the identified alarm state. Theworking region 70 continues to show the display that was active at thetime the alarm condition was detected.

FIG. 17 shows the condition of the screen 70 after the operator touchselects the alarm field button 88. The display in the status region 68changes by the removal of the alarm button field 88 and associated blockfield 92. The display in the working region 70 changes to show the textblock field 100 (also shown in FIG. 7) containing information about thedetected alarm condition and suggested ways of correcting it. Theworking region 70 also includes touch selected button fields 128 and130. The button field 128 allows the operator to resume the procedure,once the alarm condition is corrected. The button field 130 gives theoperator the option of ending the procedure.

Upon correcting the alarm condition and touch selection of the buttonfield 128, the working region 70 of the display screen 60 returns to thedisplay that was active at the time the alarm condition was firstdisplayed, which in the illustrated embodiment would be FIG. 12.

The specific computer code used for implementing the applications A1-A3,the application control manager 46, the instrument manager 56, conditionmanager 56, the interface manager 66, and the interface controller 64depends upon the computer language being used and the preferences of theprogrammer. The procedures and commands described in this specificationcan all be written by normally skilled programmers in variousconventional langauges, like C; Pascal; PLM; ADA; and multiple taskingBASIC, based upon the descriptions provided herein.

Appendix A includes illustrative functional requirements in a preferredimplementation of an interactive user interface that embodies featuresof the invention.

Various features of the invention are set forth in the following claims.##SPC1##

We claim:
 1. A blood processing system including a user interactiveinterface, the system comprisingan array of hardware elements includingan element operative for separating blood into component parts, acontroller coupled to the hardware elements operative for actuating thehardware elements to carry out a selected blood processing procedure,the controller including an input operative to receive a processparameter value for the selected blood processing procedure and anoutput operative to transmit a processing status value that changes overtime as the hardware elements carry out the selected blood processingprocedure, an interface screen having a status display region and aworking display region spaced and distinct from the status displayregion, an interface manager communicating with the interface screen andthe controller input and the controller output, the interface managerincludingmeans for generating a first display on the status displayregion including a first field, means for generating a second display onthe working display region, the second display being different than thefirst display and including a second field, means for showing in thefirst field changes in the processing status value in response to thecontroller output, means for showing in the second field the processparameter value received by the controller input while simultaneouslyshowing changes in the processing status value in the first field inresponse to controller output, and means responsive to informationreceived by the controller input to change the process parameter valueshowing in the second field on the working display region whilesimultaneously keeping changes in the processing status value showing inthe first field on the status display region.
 2. A system according toclaim 1 wherein the interface manager further includesmeans forgenerating a third display different than the first and second displays,means responsive to an input command for blanking the second display onthe working display region and generating the third display on theworking display region while simultaneously keeping changes in theprocessing status value showing in the first field on the status displayregion.
 3. A system according to claim 2wherein the third displayincludes a field, and wherein the interface manager further includesmeans for showing in the field of the third display a menu listingalternative selections.
 4. A system according to claim 3wherein thealternative selections listed on the menu include a listing of bloodprocessing procedures.
 5. A system according to claim 4and wherein thecontroller input receives information selecting one of the bloodprocessing procedures listed on the menu.
 6. A system according to claim5 wherein the interface manager includesmeans for generating in thefirst display on the status display region a third field separate anddistinct from the first field, means for showing in the third field aprocess identifier identifying the selected blood processing procedure.7. A system according to claim 2wherein the controller includes amonitoring element to sense processing conditions and to generate theinput command when sensed processing conditions fail to meet prescribedcriteria, wherein the third display includes a field, and wherein theinterface manager further includes means for showing in the field of thethird display a sensed processing condition.
 8. A blood processingsystem including a user interactive interface, the system comprisinganarray of hardware elements including an element operative for separatingblood into component parts, a controller coupled to the hardwareelements operative for actuating the hardware elements to carry out aselected blood processing procedure, the controller including an inputoperative to receive a process parameter value for the selected bloodprocessing procedure and an output operative to transmit a processingstatus value that changes over time as the hardware elements carry outthe selected blood processing procedure, an interface screen having astatus display region and a working display region spaced and distinctfrom the status display region, an interface manager communicating withthe interface screen and the controller input and the controller output,the interface manager includingmeans for generating a first display onthe status display region including a first field and a second fieldseparate and distinct from the first field, means for generating asecond display on the working display region, the second display beingdifferent than the first display and including a third field, means forshowing in the first field a process identifier identifying the selectedblood processing procedure, means for showing in the second fieldchanges in the processing status value in response to the controlleroutput, means for showing in the third field the process parameter valuereceived by the controller input while simultaneously showing theprocess identifier in the first field and changes in the processingstatus value in the second field in response to controller output, andmeans responsive to information received by the controller input tochange the process parameter value showing in the third field on theworking display region while simultaneously keeping the processidentifier showing in the first field and changes in the processingstatus value showing in the second field on the status display region.9. A system according to claim 8 wherein the interface manager furtherincludesmeans for generating a third display different than the firstand second displays, means responsive to an input command for blankingthe second display on the working display region and generating thethird display on the working display region while simultaneously keepingthe process identifier showing in the first field and changes in theprocessing status value showing in the second field on the statusdisplay region.
 10. A system according to claim 9wherein the thirddisplay includes a field, and wherein the interface manager furtherincludes means for showing in the field of the third display a menulisting alternative selections.
 11. A system according to claim10wherein the alternative selections listed on the menu include alisting of blood processing procedures.
 12. A system according to claim11and wherein the controller input receives information selecting one ofthe blood processing procedures listed on the menu, and wherein theinterface manager includes means responsive to information received bythe controller input to change the process identifier showing in thefirst field while simultaneously keeping changes in the processingstatus value showing in the second field on the status display region.13. A system according to claim 9wherein the controller includes amonitoring element to sense processing conditions and to generate theinput command when sensed processing conditions fail to meet prescribedcriteria, wherein the third display includes a field, and wherein theinterface manager further includes means for showing in the field of thethird display a sensed processing condition.